<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>列表过滤</title>
    <!-- 引入Vue -->
    <script type="text/javascript" src="../node_modules/vue/dist/vue.js"></script>
</head>
<body>
<div id="root">
    <!-- 遍历列表 -->
    <h2>人员列表</h2>
    <input type="text" placeholder="请输入名字" v-model:value="keyWord">
    <ul>
        <li v-for="(p, index) in displayPersons" :key="p.id">
            {{p.name}} -- {{p.age}} -- {{p.sex}}
        </li>
    </ul>
</div>
</body>
<script type="text/javascript">
    /*const vm = new Vue({
        el: '#root',
        data: {
            keyWord: '',
            persons: [
                {id:'001',name:'马冬梅',age:19,sex:'女'},
                {id:'002',name:'周冬雨',age:20,sex:'女'},
                {id:'003',name:'周杰伦',age:21,sex:'男'},
                {id:'004',name:'温兆伦',age:22,sex:'男'}
            ],
            displayPersons: []
        },
        watch: {
            keyWord: {
                immediate: true,
                handler(newValue, oldValue){
                    this.displayPersons = this.persons.filter((p) => {
                        return p.name.indexOf(newValue) !== -1;
                    })
                }
            }
        }
    })*/

    //用computed实现
    let vm = new Vue({
        el:'#root',
        data:{
            keyWord:'',
            persons:[
                {id:'001',name:'马冬梅',age:19,sex:'女'},
                {id:'002',name:'周冬雨',age:20,sex:'女'},
                {id:'003',name:'周杰伦',age:21,sex:'男'},
                {id:'004',name:'温兆伦',age:22,sex:'男'}
            ]
        },
        computed:{
            // 计算属性在两个时刻被调用：第一个时刻是初始化的时候，第二个时刻是依赖的数据发生变化的时候
            filPersons(){
                return this.persons.filter((p)=>{
                    return p.name.indexOf(this.keyWord) !== -1
                })
            }
        }
    })
</script>
</html>